For former couples who do stay friends, the friendship is maintained mostly as a way to access sex, money or information, not for any sentimental reasons or attachments to the former partner.

"Narcissists hate to fail or lose, so will do what they can to maintain some connection if they didn't make the choice to end it."

The study analyzed the answers of over 860 people and found that women were slightly less likely to stay friends with an ex because it was more practical or could lead to sex. However, men were slightly more likely to value practicality and sex more than women.

"Men rated sexual access higher on importance than women did, which is consistent with other research showing that men are more likely than women to form [cross sex friendships] due to sexual attraction," study authors Justin Mogilski and Dr. Lisa Welling wrote.

Narcissism expert Dr. Tony Ferretti told Broadly these findings — that people with "dark" personality traits (especially narcissistic ones) would want to hang on to past relationships — make sense because these types of people value relationships in terms of self-interest.

"Narcissists hate to fail or lose, so will do what they can to maintain some connection if they didn't make the choice to end it," Dr. Ferretti said. "They can experience narcissistic injury when rejected by a partner and have difficulties letting it go or healing from it."

People with these personality traits, he explained, "may stay connected to [exes in order to] have access to valuable resources. They also have inside information about their exes vulnerabilities and weaknesses that they can exploit and manipulate which gives them a sense of power and control."

So, next time you're deciding whether you should stay friends with an ex, take a good hard look at yourself!

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"Ask yourself one key question, can I assume positive intent when it comes to this person?” says holistic coach Ekene Onu. This matters because in most good relationships, the answer is yes — and changing your mindset to consider that can provide you with needed perspective. "Even when your partner does something that impacts you negatively, if you can assume positive intent then your approach to conflict resolution will likely be different because you know that they didn't intend to hurt you,” she says.

Constantly looking for someone to blame in the relationship when things go wrong can really add a negative tone to your interactions over time. "Instead of blaming your partner for something you don't like or upsets you, try a softer approach like saying, 'I feel upset or hurt when you leave your clothes on the floor after I told you that bothers me,’” says psychotherapist Jessica Marchena. “You can also say, 'I feel unheard and my feelings don't matter to you.’"

Make an effort to start the day off on a positive note by avoiding morning nagging and arguing, says blogger Surabhi Surendra. "Morning is the most important time of the day and thus if spent peacefully and in a loving, thankful way can lead to a peaceful, happy day,” she says.

Couples often share their dreams with each other in their early days, Onu says, but don’t necessarily keep that up over the years. They might stop for a variety of reasons, big and small — but continuing to picture your partner in your future dreams can help you keep him or her in your resent, she says.

It’s natural that after a long period of time together, you fall into a day-to-day routine. And when we all live such busy lives, it can be hard to break from the regular cycle of work-kids-housework-repeat. But that can lead couples to feel more like roommates than romantic partners. "You can repair this issue by setting goals together for you as a romantic couple,” says relationship coach Ravid Yosef. “Try date nights, holding each other while watching TV, sitting down for dinner and speaking to each other — kid-free, logistics-free talk time or doing things you love doing together."

Never saying “I love you”: Making a point of sharing your feelings, even briefly, can be a good reminder to you and your partner of why you’re in for the long haul when things are tough day to day. "This builds emotional connection,” says Marchena. "Even sending an 'I love you' text lets your mate know that you are thinking of them."

It’s easy for little gestures like hugs and kisses to slowly fall out of a relationship, but they’re important to hold on to because they can help maintain your intimacy in small ways when life is busy. "I have been married for more than six years and we still begin our mornings either with a kiss or a hug,” Surendra says. "Nothing can beat this daily ritual."

Just making a point of spending time together that doesn’t involve screens can increase you emotional connection by giving you more opportunities to really talk, or to cuddle without phones and laptops in the way. "Put the phone down after a certain time and do something together, even if it is just watching TV or a movie,” Marchena says. "And also make a rule that there are to be no screens at the dinner table. Or cuddle and be together without the screens."

"Shared experiences bond partners,” Onu says. You don’t have to do everything together — but if the only experiences you share are the mundane ones of running your household, then you’re missing out on a simple way to grow your bond as a couple. "Make an effort to have more shared experiences than not,” Onu suggests. “It gives you something to remember when things get tough.” Getting back to that can be as simple as scheduling a regular date night, signing up for a class together, or planning a vacation with just the two of you.

"We're neurologically programmed to predict the future based on our past,” says Yosef, "and so we make a lot of assumptions about how our partner feels and how they will react instead of actually acknowledging what's happening in the moment and dealing with it appropriately.” Take the time to be mindful of your thoughts and what is really behind them before you just run on them based on past behaviour in your relationships or assumptions about your partner’s intentions. “Ask yourself, is this a feeling or a fact?” she says.

"Self awareness is a powerful tool of success in every area of life — particularly in relationships,” Onu says. Take some time to think about who you are and what you need from a relationship. For example, are you an introvert who needs regular alone time to recharge and bring your best self to your partner? Knowing things like that can help your relationship by making it easier to explain your needs to your partner, or to understand theirs.